UPDATED: Export Smart Playlist Criteria v1.2
Another couple of scripts that need to reference the XML file: Export Smart Playlist Criteria is a collection of two scripts, "Export Smart Playlist Criteria" and "Export Selected Smart Playlist Criteria", each export just the criteria of the selected Smart Playlist(s) to an XML file. This file can then be imported to any iTunes using the "Import" command in the File menu. Handy for backing up Smart Playlist criteria or for sharing your Smart Playlists' criteria with other users. The latest version of each script is able to locate the XML file of a loaded multiple library.